Metrum vs Spaced Repetition Tracker

Metrum combines study cycles, syllabus tracking, focus sessions, and analytics for students across its web app and iPhone app. Study cycles rotate through subjects with individual weights, while the service tracks progress and what comes next. Users can load an exam syllabus and mark topics as theory, revision, or mastered. Sessions can be timed or logged by hand and saved to history; the iPhone timer offers Pomodoro and free-timer modes with rain, café, or forest audio. Analytics compare study hours with a daily goal and show time by subject. Study groups let users share a syllabus with friends and see who is studying. Sessions, cycles, and stats sync between web and iPhone under one account. The free plan includes one study cycle and one owned group of up to five members. Pro costs $4.99 a month or US$39.99 per year and adds unlimited cycles and groups, broader analytics periods, and export. The iPhone beta is free during beta but requires iOS 26 and Apple's TestFlight app.

Spaced Repetition Tracker is an iOS and macOS study app that logs sessions, records recall difficulty, and schedules future reviews. Its SM-2 method adapts review timing to ratings of Easy, Good, Hard, or Extremely Hard; users can also choose fixed intervals or predefined and custom plans. Coursework can be organized into subjects, groups, and topics, with separate tracking for multiple subjects. The app provides a review queue, visual timeline, calendar and session history, reminders, and iOS widgets. It can schedule topics studied through textbooks, lectures, question banks, notes, videos, cases, and flashcards. Review events can be added to Apple Calendar and Google Calendar. The free plan allows up to two subjects with six topics each and unlimited sessions. Paid choices include $5.99 a month, $29.99 a year, $49.99, paid once for Unlimited Access, and $34.99, paid once for Unlimited Access (Family). User data is stored locally and synced through Apple's iCloud CloudKit private database; the privacy policy says it is not shared with third parties or external services.